[Python-checkins] gh-121546: Disable contextvar caching on free-threading build (GH-121740)

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https://github.com/python/cpython/commit/e904300882055bed71cae59f8ca9161066659b7c
commit: e904300882055bed71cae59f8ca9161066659b7c
branch: main
author: Ken Jin <ken...@python.org>
committer: Fidget-Spinner <kenjin4...@gmail.com>
date: 2024-07-16T02:57:58+08:00
summary:

gh-121546: Disable contextvar caching on free-threading build (GH-121740)

files:
M Include/internal/pycore_context.h
M Python/context.c

diff --git a/Include/internal/pycore_context.h 
b/Include/internal/pycore_context.h
index ae5c47f195eb7f..10c1f1e52be040 100644
--- a/Include/internal/pycore_context.h
+++ b/Include/internal/pycore_context.h
@@ -35,9 +35,11 @@ struct _pycontextvarobject {
     PyObject_HEAD
     PyObject *var_name;
     PyObject *var_default;
+#ifndef Py_GIL_DISABLED
     PyObject *var_cached;
     uint64_t var_cached_tsid;
     uint64_t var_cached_tsver;
+#endif
     Py_hash_t var_hash;
 };
 
diff --git a/Python/context.c b/Python/context.c
index a3830be17908fe..c32c15f5562f24 100644
--- a/Python/context.c
+++ b/Python/context.c
@@ -203,6 +203,7 @@ PyContextVar_Get(PyObject *ovar, PyObject *def, PyObject 
**val)
         goto not_found;
     }
 
+#ifndef Py_GIL_DISABLED
     if (var->var_cached != NULL &&
             var->var_cached_tsid == ts->id &&
             var->var_cached_tsver == ts->context_ver)
@@ -210,6 +211,7 @@ PyContextVar_Get(PyObject *ovar, PyObject *def, PyObject 
**val)
         *val = var->var_cached;
         goto found;
     }
+#endif
 
     assert(PyContext_CheckExact(ts->context));
     PyHamtObject *vars = ((PyContext *)ts->context)->ctx_vars;
@@ -221,9 +223,11 @@ PyContextVar_Get(PyObject *ovar, PyObject *def, PyObject 
**val)
     }
     if (res == 1) {
         assert(found != NULL);
+#ifndef Py_GIL_DISABLED
         var->var_cached = found;  /* borrow */
         var->var_cached_tsid = ts->id;
         var->var_cached_tsver = ts->context_ver;
+#endif
 
         *val = found;
         goto found;
@@ -723,8 +727,10 @@ PyTypeObject PyContext_Type = {
 static int
 contextvar_set(PyContextVar *var, PyObject *val)
 {
+#ifndef Py_GIL_DISABLED
     var->var_cached = NULL;
     PyThreadState *ts = _PyThreadState_GET();
+#endif
 
     PyContext *ctx = context_get();
     if (ctx == NULL) {
@@ -739,16 +745,20 @@ contextvar_set(PyContextVar *var, PyObject *val)
 
     Py_SETREF(ctx->ctx_vars, new_vars);
 
+#ifndef Py_GIL_DISABLED
     var->var_cached = val;  /* borrow */
     var->var_cached_tsid = ts->id;
     var->var_cached_tsver = ts->context_ver;
+#endif
     return 0;
 }
 
 static int
 contextvar_del(PyContextVar *var)
 {
+#ifndef Py_GIL_DISABLED
     var->var_cached = NULL;
+#endif
 
     PyContext *ctx = context_get();
     if (ctx == NULL) {
@@ -823,9 +833,11 @@ contextvar_new(PyObject *name, PyObject *def)
 
     var->var_default = Py_XNewRef(def);
 
+#ifndef Py_GIL_DISABLED
     var->var_cached = NULL;
     var->var_cached_tsid = 0;
     var->var_cached_tsver = 0;
+#endif
 
     if (_PyObject_GC_MAY_BE_TRACKED(name) ||
             (def != NULL && _PyObject_GC_MAY_BE_TRACKED(def)))
@@ -863,9 +875,11 @@ contextvar_tp_clear(PyContextVar *self)
 {
     Py_CLEAR(self->var_name);
     Py_CLEAR(self->var_default);
+#ifndef Py_GIL_DISABLED
     self->var_cached = NULL;
     self->var_cached_tsid = 0;
     self->var_cached_tsver = 0;
+#endif
     return 0;
 }
 

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